Scissors-grinding machine



s; 0. Hum. v SCISSORS GRiNDING MACHINE.

- I APPLICATION FILED OCT-19' I920- I v 1,3 1,41 I Patented June 14 1921..

l? 2 yrs-sum 2.

: max/Mm UNITED STATES PATENT OFFICE.

STEPHEN 0. HEINDL, OF CHICAGO, ILLINOIS, ASSIGNOR ONE-HALF TO ERNEST ZEITZ, OF CHICAGO, ILLINOIS.

SCISSORS-GRINDING MACHINE.

Specification of Letters Patent.

Patented June 14, 1921.

Application filed October 19, 1920. Serial No. 417,977.

To all whom it may concern:

Be it known that I, STEPHEN O. HEINDL, a former subject of the Emperor of Austria, who has declared his intention of becoming a citizen of the United States, residin at Chicago, in the county of Cook and tate of Illinois, have invented certain new and useful Improvements in Scissors-Grinding Machines, of which the following is a specification.

The invention pertains to a machine for facilitating the grindingv of scissors or shears, and has for its general aim the provision of a machine which is particularly adapted for use in barber shops and in similar places by persons unskilled. 1n the art of grinding.

An important ob ect of the invention 1s to provide a machine of the character indicated which is capable of easy operation without the exercise of especial skill to effectively accomplish the sharpening of scissors.

A further object of the invention is to produce a grinding machine of the type referred to which is simply constructed so that it be manufactured at a relatively low cost, which is of compact and light weight construction so that it may be easily transported from place to place, and which presents a neat appearance.

Incidental objects of the invention are to provide combined feeding and operating 'means for the machine; an improved form of work holder or clamp; and a safety device enabling the operation of the feed block into an inoperative position permitting of the continued rotation of the feed screw.

The objects of the invention thus set forth, together with other and ancillary advantages, are attained by the construction and arrangement illustrated in the accompanying drawings forming part hereof in which Figure l is a vertical longitudinal sectional. view through a machine embodying my invention. Fig.2 is a plan view of the machine. Fig. 3 is a fragmentary end view of the work clamp. Fig. 4 is a vertical sectional view of the work clamp taken substantially in the plane of line-4 of Fig. 2.

The machine comprises generally a frame Z having mounted therein a horizontal shaft 8 constituting a combined feed screw and operating shaft. A work holder, designated generally by the numeral 9, is mounted for movement longitudinally of the frame, in the operation of the shaft 8, into and out of operative relationship with reference to a grinding wheel 10 which has a gearing connection with the shaft 8.

The frame 7 comprises a base portion in the form of an elongated plate 11 having mounted at its opposite 'ends a pair of supports or standards 12 and 13. Each of said standards is preferably made separate from the 'base plate and secured thereto as by means of screws 14: and 15, the opposite ends of the base plate being provided with ways 16 and 17 for receiving tongues 18 and 19, respectively. The rear standard 13 is made of a height substantially greater-than that of the standard 12 and substantially centrally thereof provides a bearing 20 for one end of the shaft 8 while the opposite end of said shaft is journaled near the upper end of the opposite or forward standard 12.

The work holding means 9 is operatively associated with a feed block 21 having a central screw-threaded aperture 22 therein for receiving the feed screw 8. The lower portion of said block has a central aperture 23 therein for receiving a guide rod 24 mounted at its opposite ends in the standards 12 and 13. A post 25 rises from the .block 21 and carries at its upper end a head 26 having a central horizontally and transversely disposed aperture 27 therein for receiving one end ofan arm 28 supporting at its opposite end a work clamp 29. The head 26 is split at one side to provide clamping j 'aws 30 and 31 adapted to be tightened upon the arm 27 by means of a screw 32. Said arm may be made circular in form and to insure that it shall not rotate in the head 26, may be provided with a key 33 which projects between the jaws 30 and 31 of the head. 7

The end of the arm 28, carrying the work clamp 29, is preferably disposed at substantially right angles with reference to the portion engaged by the clamping head 26, and its free end is provided with a vertically apertured head 34: in which is rotatably mounted a stem 35 carrying a fixed. clamping member 36 providing a jaw 36? and a movable clamping member 37 providmg a jaw 37 The stationary member 36 is preferably the lower one and may be secured against rotation on the stem as by means of a pin 38. A coiled compression spring 39 is interposed between the members 36 and 37 so as to normally maintain them in spaced relation as permitted by a thumb screw 40 threaded onto the upper end of the stem 35. Preferably the lower member 36 has a socket 39 therein to receive the lower end of the spring 39. To hold the clamping member 37 against rotation on the stem while per mitting its movement axially thereof, a pin 41 is fixed in the outer end ofthe member and depends into an aperture 42 in the lower or fixed member. Preferably the jaws 36 and 37 are provided in their adjacent faces with recesses or sockets 43, and the socket of the lower jaw 36 may have a hole 44 extending downwardly through the jaw to provide for the escape of foreign matter collecting in the socket. As will be readily understood, said sockets are adapted to receive the opposite ends of the central pivot or bolt securing the scissor members together. .ihus the jaws are capable of firmly gripping the members to hold them in the desired position. For the purpose of facilitating the application of pressure upon the blade being ground to hold it to the grinding wheel, the stem 35 has fixed at, as its lower end, one end of an arm 45 angular in shape with a portion extending transversely over the base plate 11 in convenient POSllZiOD to be grasped by the operator.

The grinding wheel 10 is mounted upon a stub shaft 46 journaled in the upper end of the standard 13. Preferably the wheel. is

clamped between a collar 47 and a nut 48 on the forward end of the shaft, the collar bearing against the forward face of the standard which preferably provides a journal bearing 49 for the shaft. At its opposite end the stub shaft 46 has fixed thereon a pinion 50 secured to the shaft as by means of a pin 51 and meshing with spur gear 52 secured upon the shaft 8 as by means of a pin 53. The gears 50 and 52 are proportioned, as will be readily understood, so as to operate the grinding wheel 10 at the desired speed depending upon the means employed for operating said shaft.

Herein I have illustrated a hand wheel 54 secured upon the forward end of the shaft 8 forwardly of the standard 12 so that the shaft may be manually operated. Preferably a portion of the shaft 8 at the for- .ward end thereof is reduced in diameter as shown clearly at 55 (Fig. 1), such portion being of sufficient length rearwardly of the standard 12 to accommodate the feed block 21 while disengaged from the threaded portion of the shaft, When thus disengaged,

the shaft in the reverse operation thereof.

For the purpose of inclosing the gearing connection between the shafts 8 and 46, the standard 13 is constructed to provide a chamber 58 in the rear face thereof which is closed by a face plate 59 secured in position upon the rear face of the standard as by means of screws 60.

In the operation of the machine the scissors or shears A to be ground are placed between the jaws 36 and 37 of the work holder and clamped therein by tightening the thumb screw 40 on the stem 35. This operation of placing the work in position is facilitated by reason of the fact that the jaws are normally held in spaced relation by means of the compression spring 39, and in fastening the shears in place by means of the thumb screw 40, the upper clamping member 37 is held against rotation by the pin 41 acting in the aperture 42 in the lower fixed member 36. The arm 28 having previously been adjusted in the clamping head 26 to properly position the work clamp transversely of the machine, the grinding operation is accomplished by the rotation of the shaft 8, through the medium of the hand wheel 54, or by other or preferred means; and by the manipulation of the pressure controlling arm 45. It will be observed that in the clockwise operation of the shaft 8, the blade being ground is moved gradually transversely of the grinding wheel, and is held in contact with the periphery of the wheel by drawing the free end of the arm 45 forwardly and maintaining the desired pressure thereon. lVhen the blade has been ground throughout its entire length, it is swung away from the wheel by moving the arm 45 rearwardly, and the direction of operation of the shaft 8 is reversed to restore the work holder to its initial position and hence position the blade for another operation if desired. In thus returning the work holder to the forward end of tl1e-machine the shaft 8 may be rotated more than is necessary to effect the return, without working injury to the parts. In this movement the feed block becomes disengaged from the threaded portion of the shaft 8 when at its extreme forward position, and is held in proper relation with reference to the shaft by means of the pin 56 entering the socket 57. This construction vpermits of the rapid return of the work to its initial or starting position without necessitating the expenditure of time in stopping the rotation of the shaft in order to-insure that the feed block shall be brought to'rest.

The construction which I have provided is, it will be noted, of a very practical character in that the parts are advantageously constructed and arranged into a compact and efliciently operating machine. The skill required of the operator is relatively small so that the sharpening of a pair of shears may be accomplished by one possessing little or no skill or experience. The adjustments necessary to be made are of such a simple character that they may be quickly and easily accomplished, and thus the time required for the operation is reduced to a minimum. The gearing of the operating means being inclosed the possibility of injury in the operation of the machine is substantially eliminated and at the same time the operating mechanism is inclosed so as to be free from dirt and dust and the machine is made more attractive in appearance. While the construction is of a substantially rugged character it is at the same time of comparatively light weight so that it may be easily transported from place to place. If desired, however, it may be fastened upon a bench or table as by meansof screws entered through suitable apertures provided therefor in the base of the machine.

While I have herein described the invention with considerable particularity, it will be understood that various alterations in construction and arrangement may be made without departing from the spirit and scope of the invention as expressed in the appended claims.

' I claim as my invention:

1. A grinding machine comprising, in combination, a frame having a pair of spaced supports, a drive shaft journaled at its opposite ends in said supports, a second shaft journaled in one of said supports and positioned parallel to said drive shaft, a plurality of gears housed within the last mentioned support and operatively connecting said shafts, a grinding wheel fixed on said second shaft, a feed block mounted on said drive shaft having screw threaded engagement therewith, a work holder carried by said feed block and moved thereby in parallel relation to the axis of said grinding wheel, said work holder being adapted for manually swinging the work to effect pressure thereof upon the grinding wheel, and means for operating the drive shaft.

2. A. grinding machine of the character described comprising, in combination, a pair of spaced supports, a pair of shafts mounted in said supports and operatively connected together, a grinding wheel on one of said shafts, a hand wheel on the other one of said shafts, a feed block having an operative connection with the last mentioned shaft, a

work clamp swingably mounted with reference to said feed block for movement toward and away from the grinding wheel, and a controlling arm for said clamp by means of which said clamp may be controlled.

8. A grinding machine of the character described comprising, in combination, a pair of spaced supports, a shaft having fixed thereon a grinding wheel and mounted in one of said supports, a feed screw journaled in one of said supports, a hand wheel for said screw, a feed block having screw-threaded engagement with said screw, means on said block for swingably supporting the work to be ground and movable toward and from said grinding wheel, and a controlling arm for the work holding means.

4. A grinding machine of the character described comprising, in combination, frame, a pair of shafts mounted in said frame in spacer relation, one of said shafts having a grinding element thereon, feed block having screwthreaded engagement with the other one of said shafts, a work-support ing arm mounted for adjustment transversely of the machine, a work clamp mounted on said arm for swinging movement toward and from said grinding element, neans for oierating said feed screw to more the work longitudinally of the machine, and means for controlling said work clamp.

5. In a grinding machine of the characterdescribed, the combination of a rotatable grinding element, work holding means operable to move th work toward and from the transversely of the machine, said means comprising a feed screw, a block mounted on said screw and having a threaded engagement therewith, a head on said block, an arm adapted'to be secured in said head for longitudinal adjustment therein, a work clamp swingably mounted on the free end of said arm, and means for rotating said clamp to swing the work held by said clamp toward and from'the rinding wheel.

' 6. In a grinding machine of the characte described, the combination with a rotatable grinding element, of work holding means comprising a clampingihea-tl, an arm adjustable longitudinally in said head transversely of the axis of said grinding element, a work clamp mounted on the free end of said arm for swinging movement toward and from said grinding wheel, and means for swinging said clamp whereby to hold the work to the wheel.

7. In a grinding machine of the character described, the combination with a rotatable grinding element, of work holding means comprising a clamping head, an arm adjustable longitudinally in said head transversely of the axis of said grinding element, a work clamp mounted on the free end of said arm for swinging movement toward and from ring element longitudinally and said grinding wheel, and means for swing ing said clamp whereby to hold the work to the wheel, said work clamp comprising a stem having a stationary and a movable jaw thereon, a spring acting to separate said jaws, and means for forcing the movable jaw toward the stationary jaw against the action of said spring.

8. In a machine for grinding scissors and the like, a work holding means comprising a support, a stem carried by said support, a pair of jaws mounted on said stem one of which is stationary and the other movable, a compression spring normally tending to separate said jaws, means adapted to coact with said stem to force the movable jaw toward the stationary jaw, said jaws being held against relative rotation and shaped at one end thereof to receive between them the pivoted stud of the scissors to be clamped while the blades thereof are engaged by the jaws and held against movement.

9. In a grinding machine of the character described, the combination with a feed screw, of work holding means, a block connected with said work holding means and having a screw-threaded engagement with said feed screw, said screw having a portion of reduced diameter permitting of the disengagement of said block from the screw ,at one end of its movement thereon, and

it in coaxial relation with reference to said screw while disengaged therefrom, the last mentioned means comprising a shaft upon which said block is at all times slidable, a

pin, a stationary part with reference to which said block is movable, one of said relatively movable parts having a socket for the reception of said pin.

11. In a grinding machine, a stationary part, work feeding means including a movable part, a feed screw with which said movable part has a screw-threaded connection, said movable part being operable out of operative engagement with said screw, and means comprising a pin on one of said parts and a socket on the other one of said parts adapted to receive the pin when the movable part becomes disengaged from said screw whereby to maintain the movable part in coaxial relationship with reference to the screw.

12. In a grinding machine, the combination of a frame, a grinding element rotatably supported in the frame, a shaft journaled in the frame and having a screw threaded portion, work-feeding means including a part having an operative connection with said shaft for movement thereby, and means for effecting adisconnection of said part from said shaft at one end of its travel. v V

18. A grindingmachine for scissors comprising, in combination with a grinding element, a clamp for the scissors to be ground, feeding means operable automatically in the operation of the grinding element to move the clamp transversely of the grinding element, and means for manually moving said clamp to effect pressure of a scissors blade upon the rinding element;

14. A grinding machine for scissors comprising, in combination with a grinding element, a clamp for the scissors to be ground, feedin means operable to move a scissors blade in the clamp transversely of the grinding element, said clamp being swingable to move the blade toward and from the grindmg element, and an arm for manually controlling said clamp.

STEPHEN o. HEINDL] 

